package com.atguigu.day06;

import com.atguigu.bean.WaterSensor;
import org.apache.flink.api.common.eventtime.*;
import org.apache.flink.api.common.functions.MapFunction;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.streaming.api.functions.windowing.ProcessWindowFunction;
import org.apache.flink.streaming.api.windowing.assigners.TumblingEventTimeWindows;
import org.apache.flink.streaming.api.windowing.time.Time;
import org.apache.flink.streaming.api.windowing.windows.TimeWindow;
import org.apache.flink.util.Collector;

import java.time.Duration;

import static org.apache.flink.util.Preconditions.checkArgument;
import static org.apache.flink.util.Preconditions.checkNotNull;

public class Flink01_WaterMark_Generator {
    public static void main(String[] args) throws Exception {
        //1.获取流的执行环境
        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();

        //手动设置WaterMark生成间隔时间
//        env.getConfig().setAutoWatermarkInterval(5000);

        env.setParallelism(1);

        //2.从端口读取数据并转为JavaBean同时指定WaterMark
        env.socketTextStream("localhost", 9999)
                .map(new MapFunction<String, WaterSensor>() {
                    @Override
                    public WaterSensor map(String value) throws Exception {
                        String[] split = value.split(",");
                        return new WaterSensor(split[0], Long.parseLong(split[1]), Integer.parseInt(split[2]));
                    }
                })
                .assignTimestampsAndWatermarks(
                        //TODO 自定义WaterMark
                        new WatermarkStrategy<WaterSensor>() {
                            @Override
                            public WatermarkGenerator<WaterSensor> createWatermarkGenerator(WatermarkGeneratorSupplier.Context context) {
                                return new MyWaterMarkGenerator(Duration.ofSeconds(3));
                            }
                        }
                                .withTimestampAssigner(new SerializableTimestampAssigner<WaterSensor>() {

                                    @Override
                                    public long extractTimestamp(WaterSensor element, long recordTimestamp) {
                                        return element.getTs() * 1000;
                                    }
                                })
                )
                .keyBy(r -> r.getId())
                .window(TumblingEventTimeWindows.of(Time.seconds(5)))
                .process(new ProcessWindowFunction<WaterSensor, String, String, TimeWindow>() {
                    @Override
                    public void process(String s, Context context, Iterable<WaterSensor> elements, Collector<String> out) throws Exception {
                        String msg = "当前key: " + s
                                + "窗口: [" + context.window().getStart() / 1000 + "," + context.window().getEnd() / 1000 + ") 一共有 "
                                + elements.spliterator().estimateSize() + "条数据 ";
                        out.collect(msg);
                    }
                })
                .print();

        env.execute();
    }

    //自定义WaterMark
    public static class MyWaterMarkGenerator implements WatermarkGenerator<WaterSensor>{
        //最大时间戳
        private long maxTimestamp;
        //乱序程度
        private long outOfOrdernessMillis;

        public MyWaterMarkGenerator(Duration maxOutOfOrderness) {

            this.outOfOrdernessMillis = maxOutOfOrderness.toMillis();

            this.maxTimestamp = Long.MIN_VALUE + outOfOrdernessMillis + 1;
        }

        @Override
        public void onEvent(WaterSensor event, long eventTimestamp, WatermarkOutput output) {
            maxTimestamp = Math.max(maxTimestamp, eventTimestamp);
//            System.out.println("生成WaterMark:"+(maxTimestamp - outOfOrdernessMillis - 1));
//            output.emitWatermark(new Watermark(maxTimestamp - outOfOrdernessMillis - 1));
        }

        @Override
        public void onPeriodicEmit(WatermarkOutput output) {
            System.out.println("生成WaterMark:"+(maxTimestamp - outOfOrdernessMillis - 1));
            output.emitWatermark(new Watermark(maxTimestamp - outOfOrdernessMillis - 1));
        }
    }
}
